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H. Peter Anvin 337b16213b compat: Make compat_alloc_user_space() incorporate the access_ok() 
commit c41d68a513 upstream.

compat_alloc_user_space() expects the caller to independently call
access_ok() to verify the returned area.  A missing call could
introduce problems on some architectures.

This patch incorporates the access_ok() check into
compat_alloc_user_space() and also adds a sanity check on the length.
The existing compat_alloc_user_space() implementations are renamed
arch_compat_alloc_user_space() and are used as part of the
implementation of the new global function.

This patch assumes NULL will cause __get_user()/__put_user() to either
fail or access userspace on all architectures.  This should be
followed by checking the return value of compat_access_user_space()
for NULL in the callers, at which time the access_ok() in the callers
can also be removed.

Reported-by: Ben Hawkes <hawkes@sota.gen.nz>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Chris Metcalf <cmetcalf@tilera.com>
Acked-by: David S. Miller <davem@davemloft.net>
Acked-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Tony Luck <tony.luck@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Helge Deller <deller@gmx.de>
Cc: James Bottomley <jejb@parisc-linux.org>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-09-20 13:17:57 -07:00
..
appldata sysctl: remove "struct file *" argument of ->proc_handler 2009-09-24 07:21:04 -07:00
boot kbuild: use INSTALLKERNEL to select customized installkernel script 2009-09-20 12:18:14 +02:00
crypto crypto: sha-s390 - Fix warnings in import function 2009-09-05 16:27:35 +10:00
hypfs [S390] hypfs: Use subcode 6 if subcode 7 is not available 2009-10-14 12:43:52 +02:00
include/asm compat: Make compat_alloc_user_space() incorporate the access_ok() 2010-09-20 13:17:57 -07:00
kernel timekeeping: Fix clock_gettime vsyscall time warp 2010-08-13 13:20:13 -07:00
kvm KVM: s390: Fix possible memory leak of in kvm_arch_vcpu_create() 2010-07-05 11:11:16 -07:00
lib [S390] Add EX_TABLE for addressing exception in usercopy functions. 2009-10-06 10:35:10 +02:00
math-emu [S390] remove -traditional 2008-04-30 13:38:44 +02:00
mm [S390] fix build breakage with CONFIG_AIO=n 2009-10-06 10:35:05 +02:00
oprofile Combine instrumentation menus in kernel/Kconfig.instrumentation 2007-10-19 11:53:54 -07:00
defconfig [S390] Update default configuration. 2009-09-22 22:58:46 +02:00
Kconfig perf: Do the big rename: Performance Counters -> Performance Events 2009-09-21 14:28:04 +02:00
Kconfig.debug generic debug pagealloc: build fix 2009-04-02 19:04:48 -07:00
Makefile [S390] hibernation: merge files and move to kernel/ 2009-09-11 10:29:45 +02:00